Results comparison of different source apportionment methods during APEC summit in Beijing

LIU Jia-yuan;GAO Jian;ZHANG Yue-chong;MA Tong

China Environmental Science,2020,Vol 40,No. 03

During October 8 th to November 25 th, 2014, the multi-component online monitoring technology of particulate matters and single particle aerosol mass spectrometry (SPAMS) were used to determine the particulate matter and its chemical species at an urban site in Beijing. The receptor data obtained from the multi-component online monitoring technology was analyzed by the ME2 model (OC-ME2). Source apportionment was separately conducted in two ways, ART-2 a and ME2, based on the dataset of SPAMS. The SPAMS-ART2a identified six sources, while SPAMS-ME2 and OC-ME2 both identified five. Each method identified fugitive dust, vehicle exhaust, coal combustion, industrial process, and secondary source. The results show that the main sources of particulate matters were vehicle exhaust (25.43%–28.84%) and secondary source (22.55%–33.50%), followed by coal combustion (20.16%–21.21%) and industrial process (12.01%–15.17%) by three methods. The same source from different methods had a large difference in the source contribution to particulate matter and temporal trends in contribution, which might be related to methods of sampling, chemical analysis, and data analysis. The characteristics of major pollution sources during the APEC summit and non-summit period were studied. The primary source in the analysis results of the three methods during the APEC was vehicle exhaust (29.17%–44.18%), and the contribution was higher than that during the non-summit period (23.59%–28.79%), indicating that vehicle exhaust had an important impact on the generation of particulate matters during this period.